# Probabilities of reflection

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When light is incident on a surface of water, for example, some of the light is reflected and some is transmitted and refracted. As I recall, the percentage of light that gets reflected will be determined by the quantum probability that light will reflect at that interface.

First question: Is it correct to say that the percentage of reflected light will be equal to the probability that light will reflect?

Furthermore, is the probability that light will reflect in any way related to the probability that a photon will hit a molecule "straight on" rather than obliquely? OR is the physical arrangement of molecules of no consequence to quantum probabilities?